Enantiomeric Synthesis of <scp>l</scp>-(or 1‘<i>R</i>,2‘<i>S</i>)-Carbocyclic Cyclopropyl Nucleosides
作者:Mi Gyoung Lee、Jin Fa Du、Moon Woon Chun、Chung K. Chu
DOI:10.1021/jo961523l
日期:1997.4.1
which was then converted to the urea derivative 5 and cyclopropylamine 7 by Curtius rearrangement of an acyl azide. The urea intermediate 5 was utilized to prepare thymine 10, uracil 11, and cytosine 14 derivatives. The hypoxanthine, adenine, and guanine nucleosides 21, 22, and 24 were synthesized from the amino intermediate 7.
碳环环丙基L-核苷的对映体合成是由L-古洛糖酸γ-内酯完成的。通过DIBAL-H还原和甲硅烷基保护,然后由酯2进行环丙烷化,依次由L-古洛糖伽马内酯(1)分五步制备立体中间体3,从而选择性合成了关键中间体3。环丙基中间体3的甲硅烷基化得到醇4,然后通过酰基叠氮化物的Curtius重排将其转化为脲衍生物5和环丙胺7。利用尿素中间体5制备胸腺嘧啶10,尿嘧啶11和胞嘧啶14衍生物。从氨基中间体7合成了次黄嘌呤,腺嘌呤和鸟嘌呤核苷21、22和24。